Goulds Pumps JC - IOM - Manual (Page 22)

LOCATING PROBLEMS
CONDITIONS LEADING TO
INSUFFICIENT OR NO DISCHARGE
l Insufficient speed.
l
Excessive discharge head
l
Insufficient NPSH.
l Worn pump components
l
Incorrect direction of rotation
l
Incomplete pump priming
l Impeller or discharge pipe clogged
l Pumpage viscosity too high
CONDITIONS LEADING TO
EXCESSIVE POWER
CONSUMPTION
l Excessive speed.
l Pump operating at high horsepower area of the pump
curve (off design point)
l
Mechanical binding or rubbing of rotating element.
l Pumpage specific gravity and/or viscosity too high
$
CAUTION
Always vary capacity with regulating valve in the
discharge line. NEVER throttle flow from the suction
side
$
CAUTION
Driver may overload if the pumpage specific gravity
(density) is greater than originally assumed, or the
rated flow rate is exceeded
$
CAUTION
Always operate the pump at or near the rated
conditions to prevent damage resulting form cavitation
or recirculation
s
! WARNING
Do not operate pump below minimum rated flows or
with suction and/or discharge valve closed. These
conditions may create an explosive hazard due to
vaporization of pumpage and can quickly lead to pump
failure and physical injury.
$
CAUTION
Damage occurs from:
• Increased vibration levels – affects bearings, stuffing
box or seal chamber and mechanical seal
• Increased radial loads – Stresses on shaft and bearings
• Heat build up–Vaporization causing rotating parts to
score or seize
• Cavitation–Damage to internal surfaces of pump
$
CAUTION
Observe pump for vibration levels, bearing temperature
and excessive noise. If normal levels are exceeded, shut
down and resolve.
s
! WARNING!
This unit must never be used without prior installation
of the safety guards for rotating parts as prescribed by
O.S.H.A.
Operation of this pump with both suction and
discharge valves closed for even brief periods of time is
an unacceptable and dangerous practice. it can rapidly
lead to a violent pump failure.
s
! WARNING!
Inspection intervals should be shortened appropriately
if the pumpage is abrasive and/or corrosive, or if the
environment is classified as potentially explosive.
s
! WARNING!
DO NOT apply heat to hub or nose of threaded
impeller. There is a danger of explosion.
20
JC IOM 5/08